11.6: Absolute Convergence and the Ratio and Root Test
https://math.libretexts.org/Bookshelves/Calculus/Map%3A_Calculus__Early_Transcendentals_(Stewart)/11%3A_Infinite_Sequences_And_Series/11.06%3A_Absolute_Convergence_and_the_Ratio_and_Root_Test
WebNov 10, 2020 · Roughly speaking there are two ways for a series to converge: As in the case of ∑ 1 / n2, the individual terms get small very quickly, so that the sum of all of them stays finite, or, as in the case of ∑ ( − 1)n − 1 / n, the terms do not get small fast enough ( ∑ 1 / n diverges), but a mixture of positive and negative terms provides enough cance...
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